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crustal structure and deformation of the se china revealed by receiver functions

Crustal structure and deformation of the SE China revealed b...

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作者： ya sun Syed Muzyan Shahzad Central south university

Due to the subduction of the Paleo-Pacific and Philippine plates, a large-scale magmatism and crustal thinning are generated beneath the Southeastern(se) china. However, the nature of deformation at depth in this region is still not well understood. In this study, a large numbers of receiver functions were used to investigate the crustal thickness, Vp/Vs ratio and seismic anisotropy beneath the se china using the H-κ stacking technique and a comprehensive splitting measurement technique. The measured results show that a significant high Vp/Vs ratio(～1.85) mainly spread around two areas, which formed two branches. The western branch was the North-South trend with a thin crustal thickness ～29.1 km beneath Nanxiang-Jianghan basin, the eastern branch extended along the Tanlu fault with a thin crustal thickness ～28.8 km. These two-branch significant thin crustal thickness zones are consistent with the "V-shaped crustal thinning zone". Moreover, the measured seismic anisotropy results show that most of the seismic stations located near the "V-shaped crustal thinning zone" exhibit significant seismic anisotropy with the splitting time of 0.20-0.72 s and the fast directions are parallel to the branches of the V-shape. Combining the geological data and the tectonic background, we propose that the "hot fingers" may grow from the mantle corner flow in the southern part of our "V-shape" zone associated with the collision of the Philippine plate and the eastward high angle subduction of the Eurasian plate. We also deduce that this mantle corner flow might generate the V-shaped crustal thinning and cause the Moho uplift in the se china.

关键词： crustal structure and deformation of the se china revealed by receiver functions

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